166. as a matter of course当然地,自然地
167. in(during)the course在…过程中
168. in due course(=without too much delay)没经过太久,到一定时候
169. on credit赊购;with credit以优异成绩;to one's credit使某人感到光荣;do sb. credit使…感到光荣
170.be critical of爱挑毛病的,批评的
171. cure sb. of+某种疾病治好某人的疾病
172.a danger to对…的危险;be in danger(of)处于…危险中;be out of danger脱离危险
173. to date(=so far,until now)到目前为止
174. out of date过时的;up to date新式的,时兴的;date back to可追溯到;date from从某时期开始(有)
175. deal with(=concern)论及
176. be in debt to sb.欠…的债
177. on the decline在衰退中,在减少中in decline下降;on the increase在增加
178. to one's delight令某人感到高兴;to one's regret遗憾;sorrow悲痛;relief安心;distress苦恼;shame羞愧;surprise惊奇;astonishment惊奇;
179. delight in(=take great pleasure in doing sth.)喜欢,取乐
180. take(a)delight in喜欢干…,以…为乐
n. 衰微,跌落; 晚年
v. 降低,婉谢